AquaMaxx DC Pumps can either be used externally or submerged, which is a unique feature for any pumps these days. The addition of their precise DC pump controller allows the user to adjust the output from 10-100% while also giving the option to set the pumps on timers for both cleaning and feeding. They are also manufactured with a technology known as a closed-loop impeller which allows for the use of their pumps on much higher pressure applications up to 16 freet. Features such as titanium screws, ABS plastic and bearings and shafts made of high-quality ceramic lead to nearly silent operation and exceptional performance. It's really no wonder why these pumps have become one of our top seller amongst customers with so many benefits and an amazing company standing behind them.